sensor
SEN-ser
/ˈsensə(r)/
A device which detects or measures a physical property and records, indicates, or otherwise responds to it.
A sensor is an input device; it gathers data from the environment (like heat, light, or motion) and sends a signal to a control panel.
The story behind the word. The word 'sensor' comes from the Latin verb sentire, meaning 'to feel' or 'to perceive.' This is the same root that gives us 'sense,' 'sensation,' and 'sensitive.' The word was coined in the mid-20th century to describe electronic devices that mimic human senses by detecting physical changes in their environment.
Word relationships
- detector: A detector simply reveals the presence of something (like a smoke detector), while a sensor continuously measures and responds to physical changes.
- transducer: A highly technical term for a device that converts energy from one form to another, whereas sensor is the common term for detection devices.
- actuator: A device that controls or moves a mechanism (an output), whereas a sensor is an input device that detects changes.
Commonly confused with
- detector: A sensor continuously measures physical changes, while a detector simply indicates the presence of something.
Word family
- sensitive (adjective): Highly responsive to physical stimuli.
- sensory (adjective): Relating to physical sensation or the senses.
Collocations
- motion sensor
- temperature sensor
- sensor activated
- optical sensor
Example sentences
- "A motion sensor near the garage automatically turns on the floodlights." Explaining how automated systems work.
Memory hook
Think of a 'sensor' as an electronic 'sense-organ' that feels changes in the room. A sensor senses when someone is near.
When not to use
Do not use 'sensor' to describe the alarm siren itself, which is an output device, not a detection device.
Fun facts
- The human skin is the largest natural sensor in existence, containing millions of nerve endings that detect temperature, pressure, and pain.
Related words
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